Sewing-machine



` (N'o Model.)

S. R. SARGENT.

SEWING MACHINE.

No. 284,071. Patented Aug'. 28, '1883.

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D n A N. PETERS. PhmoLilhographer. Waxhinglum D. C.

IlNiTEn STATES PATENT OFFICEo SAMUEL R. SARGENT, OF TERRE HAUTE, INDIANA.

SEWING-MACHINE.

To all w/tom, t may concern):

Be it known that I, SAMUEL R. SARGENT, of Terre Haute, county of Vigo, State of Indiana, have invented or discovered a new and useful Improvement in Sewing-Machines, and I do hereby declare the following to be a full, clear, concise, and exact description thereof, refer-V ence being had to the accompanying drawings, making a part of this specification, in whichlike letters indicating like parts- Figure l is a view in sectional elevation of a portion of the frame and driving mechanism of a sewingqnachine illustrative of my invention. Fig. 2 is a view in transverse sectional elevation, the plane of section being in the line m x, Fig. 1, and looking toward the left of that figure, and Figs. 3 and 4 are full size verticali central sections of the respective upper and i lower eccentries and connecting parts.

My present invention relates to certain improvements in the connections employed between the main driving-shaft and countershaft of sewing-machines and other similar machinery; and it consists in certain combinations of such shafts with eecentrics, eccentric-straps, and pivoted connecting rod or shaft with compensating mechanism, as hereinafter more fully described and claimed.

In the drawings, A represents a portion of the metal supporting-frame of a sewingmachine, `in the upper part of which is mounted a horizontal drivingshaft, B, to which rotary motion may be communicated in any suitable way, as by a band over pulley B. This shaft is employed to operate the needle and take-up mechanism, which is not shown, but maybe of any suitable or well-known construction with reference to performing the desired class of work. Rotary motion is also communicated from this drivingshaft to a 'counter-shaft, C, mounted parallel with it, but beneath the table, which counter-shaft may be journaled in hangers D, or other suitable bearings, and is designed tol operate the shuttle and feed mechanism, which may be of any desired construetion adapted to perform the desired work. This shuttle and feed mechanism is not shown, as such devices are well known in the art.

In order to secure good working in machines of this class, it is desirable that the two shafts B and C should be so connected as to move or `SPECIFICATION formingpart of Letters Patent No. 284,071, dated August 28, 1883.

Application filed January 8, 1863.

(No model.)

rotate together without lost motion, and with such direct and positive connection as to 1nsure uniformity of movement. In order to secure these results by easily-constructed but efiicient means, I employ two similarly-shaped eccentrics, E and I, formed on sleeve-hubs c and o', which hubs are provided with central bores adapted to fit the shafts B C, respectively. These hubs arebound upon their shafts by setscrews e fi', or equivalent means, in proper positions to bring the eceentries into a common vertical plane. The upper eccentric is surrounded by a strap7 h, which is formed on the upper divided end of eccentric rod or shaft II. The strap is pressed upon the periphery of the eccentric by tension-screw h, which is passed through the rod above the base of dividingslot h2. The strap is held upon the eccentric as against lateral displacement by a rim or collar, e2, 011 the side of the hub projection e, and by a removable face-plate, ci, heldv upon the opposite side by screw e4. The rod H is pivoted at its center by a pin, a, which eX- tends from the rod into a vertical groove, fn, (see Fig. 2,) formed in the face of box or block N, the latter being secured to the inner wall of frame-post A by screws a. The length of groove 'n' is in excess of the full vertical movement of the pin, so that the latter is retained therein through the whole range of motion of the eccentric-rod and thereby forms a pivot-fulcrum for the rod, upon which it turns with lever action under the horizontal movement of its upper end, imparted by the rotation of the eccentric E, thereby giving the two opposite ends of the eccentric-rods vibratory movement in opposite directions.

The periphery of the lower eccentric, I, is surrounded by a strap or open ring, a, the ends of which are connected by tension-screw ct, whereby the strap may be adjusted to iit the eccentric more or less closely, as desired. This strap is held against lateral displacement by substantially the same means as on the upper eccentricnthat is, by a 'rim or collar, i2, on the side of the hub-eXtension, and by a removable face-plate, i3, on the other side, which is held in place by screw i". Connection is made between the strap c and eccentrierod H by two curved arms, h3 h3, diverging from the lower end of the rod, and by screws c, passed.

IOO

4o where it is desired to drive two shafts or rocompensate for difference in'vertieal reach of `pensating movement may not injuriously affect linto a socket,A r', formed longitudinally' in the y body of the rod, the depth of such socket bemore especially for use in sewing-machines, as

through slots d in the arms and into the strap a on its opposite sides. The/se slots c permit a small range of vertical movement between the eccentric-strap and the rod sufficient to the eccentric-rod between its vertical and inclined positions; and in order that this comthe uniformity of rotation of shaft C, a pin, r, is extended upward from the eccentric-strap` ing sufiicient to receive a considerable length of pin with sufficient free space for the pin to move vertically therein under the compensating action referred to; This pin-andsocket connection will, in operation, supplement that made by screws kand slots c c in imparting to shaft C uniform movement, and these features of construction, by which such results are secured, I consider an important part of the present invention. Without such compensation for the vary ing vertical reach of the eccentric-rod, direct connectionbetween the two eccentrics could not be employed to drive the two shafts in' opposite directions without at least' considerable lost motion in some of the parts, which would impair the desired uniformity and steadiness of movement, and also increase the noise and wear. Such direct connection is desirable both for mechanical and commercial reasons. By it construction is simplified and cheapened and greater durability is secured.

While I have designed my present invention above described7 yet the same features of connection and compensation may be employed to advantage in other kinds of machinery tary bodies in opposite directions by direct connection between eccentrics, and such application I consider as coming within my invention. l

I claim herein as my invention- 1. The eccentric-rod H, having slotted d1- vergent arms h3 and a pinsocket,r, in combination with eccentric-strap a, having pin r, adapted to enter socket r', screws c, eccentric I, and shaft C, substantially as set forth.

2. In combination with shafts B C, and ec-i centrics E and I, and eccentric-rod H, straps h anda, pivot-pin n, guide N, and a yielding or, compensating connection between strap a and' rod H, substantially as described, whereby provision is made for the varying reach of the rod in direction from shaft to shaft.

3. The combination of shafts B C, eccentrics E I, eccentric-rod H, having alongitudinally-sliding pivot-bearing between itsends and slotted divergent arms h3 at one end, eccentric-strap a, and screws c, substantially as set forth.

4. The combination of eccentrics, E and I,v

SAMUEL B. SARGENT.

Witnesses:

R. H. WHITTLEsEY, C. L. PARKER. 

